72785047 has 2 divisors, whose sum is σ = 72785048. Its totient is φ = 72785046.

The previous prime is 72785021. The next prime is 72785051. The reversal of 72785047 is 74058727.

It is a strong prime.

It is an emirp because it is prime and its reverse (74058727) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72785047 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72780047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36392523 + 36392524.

It is an arithmetic number, because the mean of its divisors is an integer number (36392524).

Almost surely, 2^72785047 is an apocalyptic number.

72785047 is a deficient number, since it is larger than the sum of its proper divisors (1).

72785047 is an equidigital number, since it uses as much as digits as its factorization.

72785047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109760, while the sum is 40.

The square root of 72785047 is about 8531.4152987649. The cubic root of 72785047 is about 417.5233056181.

The spelling of 72785047 in words is "seventy-two million, seven hundred eighty-five thousand, forty-seven".